datastore/xpath_multi.py: python compatibility
datastore/xpath_multi.py: python compatibility

to work with both python2 and python3

Change-Id: I1cdf3b8f029786f9fd0623d13bb6a4853462eb1a

Signed-off-by: Anton Todorov <e150cc19eb43409ef4fcf4ffefb16532fb2bc38e@storpool.com>

OpenNebula/addon-storpool,OpenNebula/addon-storpool,OpenNebula/addon-storpool